Study on Microstructural Evolution and Strength Growth and Fracture Mechanism of Cemented Paste Backfill

Table 5

Uniaxial compression strength of CPB (unit: MPa).

Cement sand ratio	Curing age/d	Solid phase mass fraction/%
		65	68	70	73	75
1 : 4	3	0.28	0.36	0.46	0.6	0.84
	7	0.81	0.96	1.39	1.61	1.96
	28	2.15	2.88	3.68	4.62	5.48
1 : 5	3	0.27	0.31	0.39	0.48	0.66
	7	0.72	0.81	1.34	1.58	1.91
	28	1.80	2.22	3.02	3.91	5.00
1 : 6	3	0.26	0.28	0.34	0.44	0.51
	7	0.69	0.80	1.30	1.53	1.89
	28	1.34	1.60	2.13	2.85	3.74
1 : 8	3	0.18	0.22	0.28	0.36	0.41
	7	0.31	0.39	0.56	0.66	0.70
	28	1.05	1.36	1.78	2.11	2.61
1 : 10	3	0.15	0.20	0.26	0.34	0.38
	7	0.24	0.36	0.44	0.58	0.63
	28	0.61	0.79	1.14	1.43	1.81